Most early Eee PCs use 533/667 MHz
DDR2 SDRAM via a standard SO-DIMM module, which can be swapped out. The 700 and 701SDX have RAM soldered to the motherboard. Other models (like the white 4GS-W010) had lacked memory access panels and required disassembly to upgrade memory.
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Later models, such as the black model EEEPC 4G SURF (4GS-PK008), and newer white models (4GS-W010) have a removable panel on their underside that allows the user to change the RAM without fully disassembling the system.